diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php
index 0ca4172de4075..b9fbe67f84335 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/AboutCommand.php
@@ -125,7 +125,7 @@ private static function formatFileSize(string $path): string
 
     private static function isExpired(string $date): bool
     {
-        $date = \DateTime::createFromFormat('m/Y', $date);
+        $date = \DateTime::createFromFormat('d/m/Y', '01/'.$date);
 
         return false !== $date && new \DateTime() > $date->modify('last day of this month 23:59:59');
     }
diff --git a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
index b680d0d7976df..2ab3048ed226c 100644
--- a/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
+++ b/src/Symfony/Component/HttpKernel/DataCollector/ConfigDataCollector.php
@@ -71,8 +71,8 @@ public function collect(Request $request, Response $response, \Exception $except
             $this->data['symfony_state'] = $this->determineSymfonyState();
             $this->data['symfony_minor_version'] = sprintf('%s.%s', Kernel::MAJOR_VERSION, Kernel::MINOR_VERSION);
             $this->data['symfony_lts'] = 4 === Kernel::MINOR_VERSION;
-            $eom = \DateTime::createFromFormat('m/Y', Kernel::END_OF_MAINTENANCE);
-            $eol = \DateTime::createFromFormat('m/Y', Kernel::END_OF_LIFE);
+            $eom = \DateTime::createFromFormat('d/m/Y', '01/'.Kernel::END_OF_MAINTENANCE);
+            $eol = \DateTime::createFromFormat('d/m/Y', '01/'.Kernel::END_OF_LIFE);
             $this->data['symfony_eom'] = $eom->format('F Y');
             $this->data['symfony_eol'] = $eol->format('F Y');
         }
@@ -292,8 +292,8 @@ public function getName()
     private function determineSymfonyState(): string
     {
         $now = new \DateTime();
-        $eom = \DateTime::createFromFormat('m/Y', Kernel::END_OF_MAINTENANCE)->modify('last day of this month');
-        $eol = \DateTime::createFromFormat('m/Y', Kernel::END_OF_LIFE)->modify('last day of this month');
+        $eom = \DateTime::createFromFormat('d/m/Y', '01/'.Kernel::END_OF_MAINTENANCE)->modify('last day of this month');
+        $eol = \DateTime::createFromFormat('d/m/Y', '01/'.Kernel::END_OF_LIFE)->modify('last day of this month');
 
         if ($now > $eol) {
             $versionState = 'eol';